The Viswa Vajra could be an amulet conferring protection from evil (Danger Sense), or adding DR through its association with the durability of diamonds. It could also be used to grant bonuses to Will or IQ rolls, due to its use to calm the mind. You could take it further an perhaps give it offensive capabilities with lightning attacks. Is that a helpful start?

Yes that exactly the kind of interesting treasure/ magic items I want. Thanks.